Abstract
This study investigated whether exercise training could prevent the negative side effects of dexamethasone. Rats underwent a training period and were either submitted to a running protocol (60% physical capacity, 5 days/week for 8 weeks) or kept sedentary. After this training period, the animals underwent dexamethasone treatment (1 mg/kg per day, i.p., 10 days). Glycemia, insulinemia, muscular weight and muscular glycogen were measured from blood and skeletal muscle. Vascular endothelial growth factor (VEGF) protein was analyzed in skeletal muscles. Dexamethasone treatment evoked body weight loss (−24%), followed by muscular atrophy in the tibialis anterior (−25%) and the extensor digitorum longus (EDL, −15%). Dexamethasone also increased serum insulin levels by 5.7-fold and glucose levels by 2.5-fold compared to control. The exercise protocol prevented atrophy of the EDL and insulin resistance. Also, dexamethasone-treated rats showed decreased muscular glycogen (−41%), which was further attenuated by the exercise protocol. The VEGF protein expression decreased in the skeletal muscles of dexamethasone-treated rats and was unaltered by the exercise protocol. These data suggest that exercise attenuates hyperglycemia and may also prevent insulin resistance, muscular glycogen loss and muscular atrophy, thus suggesting that exercise may have some benefits during glucocorticoid treatment.
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Acknowledgments
Matheus Barel (06/51936-2) and Otávio André Brogin Perez (06/51935-6) were supported by a fellowship from FAPESP (Fundação de Amparo à Pesquisa do Estado de São Paulo). The authors thank Flávio Ismael da Silva Oliveira for his expert technical assistance and Lisete C. Michelini, PhD and Luciana V. Rossoni, PhD, for their expert comments on the manuscript. This research was also supported by FUNDUNESP (Fundação para o Desenvolvimento da UNESP (00540/06). The authors also thank coordinators of LAPEF (Dr. Nabeiro, treadmill) and LAFIPE (Dr. Bosqueiro, molecular biology experiments). Without these laboratories this study could not have been completed.
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Communicated by Susan Ward.
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Barel, M., Perez, O.A.B., Giozzet, V.A. et al. Exercise training prevents hyperinsulinemia, muscular glycogen loss and muscle atrophy induced by dexamethasone treatment. Eur J Appl Physiol 108, 999–1007 (2010). https://doi.org/10.1007/s00421-009-1272-6
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DOI: https://doi.org/10.1007/s00421-009-1272-6